Why text is better than video?
You can put keywords in a video. But text has the keywords already there. People will search for it using terms you didn't even realize were important when you wrote them.
What is the purpose of a tutorial video?
Tutorial videos are the go-to instructional method for teaching a process or giving step-by-step instructions and are sometimes referred to as “how-to” videos. Training videos are designed to improve employees' workplace skills and often use footage of real people to connect the trainer to the trainee.